diff --git a/libarmbox/Makefile.am b/libarmbox/Makefile.am
index fb81b20..0c1a721 100644
--- a/libarmbox/Makefile.am
+++ b/libarmbox/Makefile.am
@@ -21,7 +21,6 @@ libarmbox_la_SOURCES = \
 	dmx.cpp \
 	video.cpp \
 	audio.cpp \
-	audio_mixer.cpp \
 	init.cpp \
 	playback_gst.cpp \
 	pwrmngr.cpp \
diff --git a/libarmbox/audio.cpp b/libarmbox/audio.cpp
index 3eb0a97..909b019 100644
--- a/libarmbox/audio.cpp
+++ b/libarmbox/audio.cpp
@@ -10,7 +10,7 @@
 
 #include <proc_tools.h>
 #include "audio_lib.h"
-#include "audio_mixer.h"
+//#include "audio_mixer.h"
 #include "lt_debug.h"
 
 #define AUDIO_DEVICE	"/dev/dvb/adapter0/audio0"
@@ -27,9 +27,11 @@ cAudio::cAudio(void *, void *, void *)
 	clipfd = -1;
 	mixer_fd = -1;
 
+/*
 	mixerAnalog = mixerHDMI = mixerSPDIF = NULL;
 	volumeAnalog = volumeHDMI = volumeSPDIF = 0;
-	mixersMuted = false;
+	mixersMuted = false
+*/
 
 	openDevice();
 	Muted = false;
@@ -37,13 +39,13 @@ cAudio::cAudio(void *, void *, void *)
 
 cAudio::~cAudio(void)
 {
-	closeMixers();
+	//closeMixers();
 	closeDevice();
 }
 
 void cAudio::openDevice(void)
 {
-	openMixers();
+	//openMixers();
 
 	if (fd < 0)
 	{
@@ -58,7 +60,7 @@ void cAudio::openDevice(void)
 
 void cAudio::closeDevice(void)
 {
-	closeMixers();
+	//closeMixers();
 
 	if (fd > -1) {
 		close(fd);
@@ -385,7 +387,9 @@ void cAudio::SetSRS(int /*iq_enable*/, int /*nmgr_enable*/, int /*iq_mode*/, int
 
 void cAudio::SetHdmiDD(bool enable)
 {
-	lt_debug("%s\n", __FUNCTION__);
+	const char *opt[] = {  "downmix", "passthrough" };
+	lt_debug("%s %d\n", __func__, enable);
+	proc_put("/proc/stb/audio/ac3", opt[enable], strlen(opt[enable]));
 }
 
 void cAudio::SetSpdifDD(bool enable)
@@ -413,6 +417,7 @@ void cAudio::setBypassMode(bool disable)
 		lt_info("%s AUDIO_SET_BYPASS_MODE %d: %m\n", __func__, mode);
 }
 
+#if 0
 void cAudio::openMixers(void)
 {
 	if (!mixerAnalog)
@@ -464,3 +469,4 @@ void cAudio::muteMixers(bool m)
 		setMixerVolume("SPDIF", volumeSPDIF, false);
 	}
 }
+#endif
diff --git a/libarmbox/audio_lib.h b/libarmbox/audio_lib.h
index 8a71732..5fb3e9c 100644
--- a/libarmbox/audio_lib.h
+++ b/libarmbox/audio_lib.h
@@ -100,10 +100,12 @@ class cAudio
 		void ScheduleMute(bool On);
 		void EnableAnalogOut(bool enable);
 
+#if 0
 		void openMixers(void);
 		void closeMixers(void);
 		void setMixerVolume(const char *name, long value, bool remember = true);
 		void muteMixers(bool m = true);
+#endif
 };
 
 #endif